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Environmental fate & pathways

Phototransformation in air

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Link to relevant study record(s)

Description of key information

Photodegradation in the air of 8-2 FTOH: 
- Lifetime = 11 d
- Main degradation products in the air: CnF(2n+1)CH2CHO and CnF(2n+1)CHO successively formed.

Key value for chemical safety assessment

Degradation rate constant with OH radicals:
0 m³ molecule-1 s-1

Additional information

Photodegradation in the air: a study on the photodegradation in the air of 8 -2 FTOH (2POE as cited in the study report) is available (Telomer Research Program, 2003).

Since preliminary tests showed difficulties in testing because of the low vapour pressure of the substance of study, an alternative approach was tried with 2 surrogates of 2POE. Fluorinated alcohols of short-chain (CF3CH2CH2OH = TFP and C6F13CH2CH2OH = TDO) were used to extrapolate the rate constant and lifetime of 8 -2 FTOH. The studies have been carried out using two photoreactors: a 150 L Teflon bag irradiated by lamps at CNRS-Orleans for the kinetics and mechanistic studies, and the 200 m³ European photreactor, EUPHORE, irradiated by sunlight at Valencia (Spain) also for the mechanistic study. Same values were obtained for the two substances tested, therefore a value of K = 1.06x10E-12 +/-0.2 cm³/molec*s for the 8-2 FTOH molecule was recommended. The major products observed were the fluoroaldehydes CnF(2n+1)CH2CHO and CnF(2n+1)CHO in the presence and absence of NOx. It was observed that these two type of compounds are succesively formed and CF2O is the end product. PAN like compounds (e.g. CF3CH2C(O)OONO2) were also observed in the presence of NOx. This mechanism can be generalised for the larger fluoroalcohols, including 2POE.